# Best social media posting and scheduling APIs for AI agents (slim)

> Zernio (formerly Late) API + MCP (B), Buffer API + MCP (B) and bundle.social (C) lead the 15 ranked social media posting and scheduling APIs. Picks by need, strengths, weaknesses and prices from the Anchor benchmark.

- Full: https://www.anchorterminal.com/best/social-media/index.md (~5,600 tokens) · this version ~1,330 tokens · JSON https://www.anchorterminal.com/best/social-media/index.json · canonical https://www.anchorterminal.com/best/social-media/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

The 10 highest-scoring of 15 social media posting and scheduling APIs on the Anchor benchmark, with a pick for each need and where each one falls short. Scores come from public evidence, re-checked as vendors change.

- Ranked: 15 · agent-ready (BB or better): 0 · accept x402: 0 · hosted endpoints: 14
- Full ranked table: https://www.anchorterminal.com/categories/social-media.md
- Head-to-head comparisons: https://www.anchorterminal.com/compare/social-media/index.md (103)
- Methodology: https://www.anchorterminal.com/benchmark/index.md

## The shortlist

| # | Tool | Grade | Score | Best for | Price | Where |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | [Zernio (formerly Late) API + MCP](https://www.anchorterminal.com/tools/late.md) | B | 67.5 | Agents and SaaS products that need posting, inbox and ads through one well-specified API with safe retries. | $6 / mo | hosted and local |
| 2 | [Buffer API + MCP](https://www.anchorterminal.com/tools/buffer.md) | B | 62 | Personal and small-team posting where the free plan and OAuth MCP are enough. | $5 / mo | hosted |
| 3 | [bundle.social](https://www.anchorterminal.com/tools/bundle-social.md) | C | 60.1 | A SaaS product or agent that manages many accounts for many customers, since paid plans do not charge per connected account and teams separate tenants. | $100 / mo | hosted and local |
| 4 | [Postiz API + MCP](https://www.anchorterminal.com/tools/postiz.md) | C | 59.3 | Teams that want to self-host, or want 34 platforms including Mastodon, Farcaster, Discord and Slack on a flat plan. | $29 / mo | hosted |
| 5 | [Upload-Post API + MCP](https://www.anchorterminal.com/tools/upload-post.md) | C | 58.7 | Video-heavy publishing to TikTok, Reels and Shorts at a low price, and for white-label products that link end users through JWT connect pages. | $24 / mo | hosted and local |
| 6 | [Ayrshare API + MCP](https://www.anchorterminal.com/tools/ayrshare.md) | C | 57.2 | SaaS products that post for many end users and need comments, DMs, analytics and automations from one API. | $149 / mo | hosted |
| 7 | [X MCP](https://www.anchorterminal.com/tools/x-mcp.md) | C | 55.4 | Research and monitoring on X by an agent whose owner already has, or will pay for, an X developer app, such as searching the archive, reading timelines and mentions, and filing bookmarks. | $0.005 / call | hosted and local |
| 8 | [Sprout Social API](https://www.anchorterminal.com/tools/sprout-social.md) | C | 54.7 | Reporting agents that pull profile, post, inbox, listening and case data for a company that already pays for Sprout Social, and for drafting posts a person will approve. | $399 / seat-mo | hosted |
| 9 | [Mixpost API + MCP](https://www.anchorterminal.com/tools/mixpost.md) | D | 49.5 | Agencies and teams that must keep tokens and content on their own servers and want a one-off price. | Paid | local |
| 10 | [Typefully](https://www.anchorterminal.com/tools/typefully.md) | D | 49.1 | An agent that drafts and schedules posts for one person's or one team's own accounts, with a human reviewing drafts and comments in the Typefully editor. | Freemium | hosted |

## Picks by need

- Highest score overall: [Zernio (formerly Late) API + MCP](https://www.anchorterminal.com/tools/late.md), B, 67.5/100 on the benchmark. Also [Buffer API + MCP](https://www.anchorterminal.com/tools/buffer.md), B, 62/100.
- Schema & documentation: [Postiz API + MCP](https://www.anchorterminal.com/tools/postiz.md), 88/100 on schema & documentation, against 83 for the overall leader.
- Security & auth: [Sprout Social API](https://www.anchorterminal.com/tools/sprout-social.md), 61/100 on security & auth, against 57 for the overall leader.
- Transparency & trust: [Postiz API + MCP](https://www.anchorterminal.com/tools/postiz.md), 81/100 on transparency & trust, against 58 for the overall leader.
- Self-hosting under an open licence: [Postiz API + MCP](https://www.anchorterminal.com/tools/postiz.md), self-hosted, AGPL-3 licence. Also [Mixpost API + MCP](https://www.anchorterminal.com/tools/mixpost.md), self-hosted, proprietary licence.

## How to choose

- Networks reached and their approval: Check which networks the API reaches and whether each one needs an app review or a business account, since that decides how soon an agent can post.
- Price per connected profile: Multiply the price per connected profile by the number of accounts the agent will manage, since cost grows with every account added.
- Media types and upload limits: Check which image and video formats the upload path accepts and how large they can be, because an agent that cannot attach media will post text only.
- Self-hosting and draft states: Check whether the service can be self-hosted and how drafts, scheduled and published states are tracked, so the agent can resume a queue after a restart.

Each listing's verdict, strengths and weaknesses: https://www.anchorterminal.com/best/social-media/index.md